Player stats

Strikeouts per 9 Innings 2023

Strikeouts per nine innings pitched. Unlike K%, the denominator is innings rather than batters faced.

Season

Minimum workload: one inning pitched per game. Completed seasons use the league's scheduled regular-season game count; seasons in progress use team games played. This is a general pitching minimum, not a relief-pitcher qualification rule. Data through December 31, 2023. Data refreshed Sep 12, 2026, 7:39 AM UTC.

No. 1 / Strikeouts per 9 Innings / 2023

Spencer Strider

ATL

13.55

Season leader

Strikeouts per 9 Innings2023 season
#	Player	Team	IP	BF	K/9
1	S. StriderSpencer Strider	ATL	186.2	763	13.55
2	B. SnellBlake Snell	SD	180.0	742	11.70
3	K. GausmanKevin Gausman	TOR	185.0	763	11.53
4	F. PeraltaFreddy Peralta	MIL	165.2	680	11.41
5	K. SengaKodai Senga	NYM	166.1	694	10.93
6	D. CeaseDylan Cease	CWS	177.0	784	10.88
7	P. LópezPablo López	MIN	194.0	801	10.86
8	J. LuzardoJesús Luzardo	MIA	178.2	741	10.48
9	C. MortonCharlie Morton	ATL	163.1	716	10.08
10	L. CastilloLuis Castillo	SEA	197.0	802	10.01
11	L. GiolitoLucas Giolito	CLE	184.1	794	9.96
12	Z. WheelerZack Wheeler	PHI	192.0	787	9.94
13	M. KellerMitch Keller	PIT	194.1	825	9.73
14	Y. KikuchiYusei Kikuchi	TOR	167.2	700	9.72
15	G. ColeGerrit Cole	NYY	209.0	821	9.56
16	M. KellyMerrill Kelly	AZ	177.2	722	9.47
17	Z. GallenZac Gallen	AZ	210.0	846	9.43
18	Z. EflinZach Eflin	TB	177.2	703	9.42
19	A. NolaAaron Nola	PHI	193.2	793	9.39
20	L. LynnLance Lynn	LAD	183.2	808	9.36
21	C. BurnesCorbin Burnes	MIL	193.2	784	9.29
22	J. SteeleJustin Steele	CHC	173.1	716	9.14
23	F. ValdezFramber Valdez	HOU	198.0	808	9.09
24	K. BradishKyle Bradish	BAL	168.2	671	8.96
25	S. GraySonny Gray	MIN	184.0	754	8.95
26	L. GilbertLogan Gilbert	SEA	190.2	770	8.92
27	C. JavierCristian Javier	HOU	162.0	687	8.83
28	J. BerríosJosé Berríos	TOR	189.2	782	8.73
29	J. SearsJP Sears	OAK	172.1	735	8.41
30	C. BassittChris Bassitt	TOR	200.0	826	8.37
31	D. KremerDean Kremer	BAL	172.2	735	8.18
32	G. KirbyGeorge Kirby	SEA	190.2	757	8.12
33	L. WebbLogan Webb	SF	216.0	850	8.08
34	J. OviedoJohan Oviedo	PIT	177.2	781	8.00
35	J. VerlanderJustin Verlander	HOU	162.1	669	7.98
36	J. MontgomeryJordan Montgomery	TEX	188.2	777	7.92
37	K. GibsonKyle Gibson	BAL	192.0	807	7.36
38	S. AlcantaraSandy Alcantara	MIA	184.2	762	7.36
39	D. DunningDane Dunning	TEX	172.2	722	7.30
40	T. WalkerTaijuan Walker	PHI	172.2	733	7.19
41	B. ElderBryce Elder	ATL	174.2	732	6.60
42	P. CorbinPatrick Corbin	WSH	180.0	790	6.20
43	M. MikolasMiles Mikolas	STL	201.1	860	6.12
44	J. LylesJordan Lyles	KC	177.2	748	6.08

K/9: Strikeouts per nine innings pitched. Unlike K%, the denominator is innings rather than batters faced.

Understanding Strikeouts per 9 Innings

Strikeouts per nine innings pitched. Unlike K%, the denominator is innings rather than batters faced.

Formula: 27 × SO ÷ outs recorded

Read rates alongside playing time. A small sample can produce an extreme result, and a missing value is different from zero.

Season rankings use regular-season records. A player has one combined row across teams; the team label identifies the associated team, not a separate team stint.

Source: MLB statistics and MLBDB derived measures. Formulas describe the measure above. Data refreshed Sep 12, 2026, 7:39 AM UTC.